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Try turning the color control up and down with the fine tuning turned off station like you had done...does the hue of the picture change at all (like from black and white to a purplish hue)...if you get some color change this means that the chroma signal channel is working but the 3.58 mhz oscillator is not.
If there is absolutely no change in color there is a break in the chroma signal path.
This is a discrete transistor chassis which is kind of laid out like the CTC-39, it consists of transistors soldered directly to the circuit boards, no modules.
I have not worked on ctc-40 personally---have done research on it though: I think it would be pretty difficult to change out a whole board as they are soldered to the chassis and have a lot of connections.
We use a B&K transistor tester which identifies leads of transistors and good/bad quality...it has made the difference between successful repair of transistor equipment without even needing a schematic or real difficult troubleshooting and not being able to fix the item. I would highly recommend an in circuit trans. tester such as this...ours has never been wrong.
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